Improved mode of recovering the spent acid from oil-refineries



aorta sum 1 Qatrnt Ghfiilite,

' To all vhom it may conccrn dustrial or other process,

therein to rise to the surface LEVI S. FALES, OF NEW YORK, N. Y.,

Assreuon To THE AMERICAN .FER-

TILIZER COMPANY.

Letters Patent No. 97 ,182, dated November 23, 1869.

IMfROVED MODE 0 RECOVERING- THE SPENT ACID FROM OIL-REFINERIES.

The Schedule referred to in these Letters Patent and making part of the same.

Be it known that I, LnvIS. FALES, of the city, county, and State of 'N ew York, have invented a new andimproved Method of Rebovering SpcntAcid from Oil-Refineries, &c.; and I do hereby declare'that the following is a full, clear, and exact description of the same. 7

The object of this invention is to utilize or recover the acid ordinarily wasted inoil-refiueries, thereby enabling such acid to be used again in any suitable in-' The invention consists in a novel method of insuring the removal of thetarry matter and the-like from the spent-acid solution, whereby the desired result is of my eii'ectually secured.

To enable others to understand the nature invention, I will proceed to describe it. a

In any ordinary or suitable closed boiler, I place any desired quantity of the ammoniaoal liquor oi'gas works.

This boiler, for the purpose presently herein explained, I connect with avseparate lead-lined tank, by means of an appropriate pipe, or its equivalent.

In this tank, I place the spentacid solution to be treated. Thequantity-of this may be greater or less,

as desired, but to every fifteen hundred Weight of such solution, I add, say, twenty-five pounds of sulphate of potash, or, 'in place of this, an equal quantity of sulphate of ammonia.

The object of adding the one or the other, as the case may be, of these materials, is to impart to'the liquid a consistency, which is found, in practice, to be advantageous in carrying out, the process-of purification.

To the liquidthus prepared, should be added about. one-half its weight of water.

- These preliminaries having been attended 'to, heat is applied to the boiler containing the ammouiacal liquor, and ammoniacal vapors from the latter are driven over into the tank holding the spent 'acid.'

The efl'ect of the anmion-iacal vapor upon the spentacid solution is to cause the tarry matter suspended and collect. thereat in a layer or thickness. p a

This effect having been produced to the requisite degree, the influx of the ammoniacal vapors is shut off, and the solution allowed to rest for several hours, say from eight to twelve.

During this time, the layer of tarry matter agglutinates, and in its viscid condition may be removed bodily. from the surface, leaving the solution in a comparatively clear and purified, but diluted condition.

In order to concentrate the thus purified liquid or solution, it is drawn ofl into pans, which should be linedwith lead, in order toresist the corrosive action of the acid. These pans being arranged in connection with suitable furnaces, whereby the solution may be evaporated to about 60 Baum, care should be'taken to agitate the solution during the evaporating-process; and it is preferred to add, previous to the commencement of the latter, a quantity, say twenty-five pounds, of sulphate of soda for every fifteen hundred pounds of the spent acid originally employed.

It shouldalso be mentioned, that when desired, the evaporation may be carried much further thanabove' indicated, by the use of glass or platinum pans in the usual or any suitable manner.

, The liquid or product resulting from the hereindescribed treatment of the spent acid fi'OIIIOllf-Iefiueries, while not absolutely pure, is sufficiently so to render it available for ordinary industrial purposes, as,-

for instanoe,the purification of petroleum, the manu- 1 facture of sulphate of ammonia, the fabrication of artificial manures, 85c.

, What I claim as my invention, and desire to secure Witnesses Fun. HAYNES, R, E. RABEAU. 

